On the leg from Novokuznetsk to Tashtagol of a flight from Kemerovo to Tashtagol when encountered below minima weather conditions (low clouds and rain), failed to return, deviated from the prescribed flight path to the left by 8 km and crashed at a height of 1,050 metres into the wooded slope of cloud-covered Mount Pustag (1,570 metres), some 25 km north of Tashtagol (at N52°58' E87°54'). All 3 crew, including a check pilot, and both passengers were killed.